A 45-storey office tower complex, on the southern edge of the historic financial district of Boston, was proposed to replace an existing two-storey parking garage. Among other amenities to be included in the design were to be a rooftop club and restaurant, a roof garden, and a retail core at street level with a multi-storey atrium and lobby. The challenge was to bring natural light into the lower levels of the tower, which were enclosed by the adjacent building. The inclined light-shaft was designed at the angle of sunlight at midday on the winter solstice, thus maximizing the amount of natural light which would penetrate internal office spaces during the winter.